Water-cooled auxiliary ultrasonic enhanced friction stir additive repair device and method

Abstract

The application discloses a water-cooling auxiliary ultrasonic enhanced friction-stir additive repair device and method, wherein the water-cooling auxiliary ultrasonic enhanced friction-stir additive repair device is mainly composed of a main shaft, a workbench and an ultrasonic water-cooling mechanism; the ultrasonic water-cooling mechanism comprises a water-cooling shaft shoulder, a static concave table, a water-cooling device, a guide pipe, a shaft shoulder track, an ultrasonic vibration device, a flange, an ultrasonic base and a lifting part. When the device is used for friction-stir repair, the water-cooling auxiliary structure formed by the water-cooling shaft shoulder, the static concave table and the water-cooling device can reduce the influence of thermal cycle on the repetitive heat treatment of the deposited alloy, meanwhile, the ultrasonic plastic effect generated by the ultrasonic vibration device can promote the metal deposition, and the structure and performance of the repair area are strengthened. The application solves the technical problem that it is difficult to coordinate the plastic forming and the avoidance of the coarsening of the deposited phase during the repair of the aluminum alloy component, and efficiently and high-quality strengthens the structure and performance of the repair area.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of additive manufacturing, in particular to a water-cooling assisted ultrasonic enhanced friction stir additive repair device and method. BACKGROUND

[0002] Additive friction stir deposition (AFSD) is a high-efficiency solid-phase deposition process, which is characterized by that the deposited layer metal does not melt, avoiding the formation of defects such as pores and thermal cracks, and the intense plastic deformation induces recrystallization of the structure, so that highly refined equiaxed grains can be obtained, and thus the deposited structure or the repaired area has a density similar to that of forged materials. However, it is found that for heat-treatable aluminum alloys, the repeated heat treatment of the deposited metal by the AFSD process itself will cause the coarsening of the precipitates, and these coarsened precipitates are difficult to effectively hinder the movement of dislocations, resulting in the softening of the repaired area and the reduction of the tensile properties. In addition, the incoordination deformation of the interface between the coarsened precipitates and the matrix leads to a low fatigue life of the structure. Therefore, for precipitate-strengthened alloys, the AFSD process can be used to repair the structure to improve the integrity of the structure, but it is difficult to obtain a repaired area with excellent performance. SUMMARY

[0003] The purpose of the present application is to overcome the deficiencies of the prior art, and to provide a water-cooling assisted ultrasonic enhanced friction stir additive repair device and method. The water-cooling assisted ultrasonic enhanced friction stir additive repair device and method can reduce the influence of thermal cycling on the repeated heat treatment of the deposited alloy based on the water-cooling assisted device, and at the same time, the plastic effect of ultrasonic waves can promote metal deposition, so as to strengthen the structure and performance of the repaired area.

[0004] The application realizes the technical scheme as follows: the device for water-cooled auxiliary ultrasonic enhanced friction stir additive repair, comprising a main shaft, a workbench and an ultrasonic water-cooling mechanism, the main shaft is arranged above the workbench; the ultrasonic water-cooling mechanism comprises a water-cooling shaft shoulder, a stationary recess, a water-cooling device, a conduit, a shaft shoulder track, an ultrasonic vibration device, a flange, an ultrasonic base and a lifting component, the lifting component is installed outside the workbench, the stationary recess is installed on the lifting component through the shaft shoulder track, and the stationary recess is above the workbench, the water-cooling shaft shoulder is installed at the lower end of the stationary recess, the side surface of the stationary recess is provided with a light hole through which the tool head of the ultrasonic vibration device passes, the central hole through which the additive repair rod fixed to the main shaft passes is arranged in the middle of the stationary recess and the water-cooling shaft shoulder, the light hole through which the tool head of the ultrasonic vibration device passes is communicated with the central hole, the water-cooling shaft shoulder is provided with a water guide channel, and the water guide channel is connected through the water-cooling conduit and the water-cooling device; the ultrasonic vibration device is fixed to the flange, the flange is installed on the ultrasonic base through a sliding rod, the ultrasonic base is installed on the lifting component, and the tool head of the ultrasonic vibration device is coaxially arranged with the light hole; the ultrasonic base is provided with a pneumatic cylinder, and the telescopic rod of the pneumatic cylinder is connected with the flange.

[0005] Preferably, the water guide channel has two, and the two water guide channels are symmetrically arranged relative to the axis of the water-cooling shaft shoulder.

[0006] Preferably, the water guide channel is in the form of a circular ring, and the axis of the water guide channel is on the same straight line as the axis of the water-cooling shaft shoulder.

[0007] Preferably, the bottom surface of the water-cooling shaft shoulder is arranged as an inclined surface.

[0008] Preferably, the lifting component comprises two groups of lifting assemblies, the two groups of lifting assemblies are arranged on the two sides of the workbench, the lifting assembly comprises a lifting base, a lifting plate, a lifting track, an electric cylinder and a motor, the lower end of the lifting track is installed on the lifting base, the two ends of the lifting plate are respectively installed on the corresponding lifting tracks, the electric cylinder and the motor are both installed on the lifting base, the motor is connected with the electric cylinder, and the telescopic rod of the electric cylinder is connected with the lifting plate; the two ends of the shaft shoulder track are respectively fixed on the corresponding lifting plates, the ultrasonic base is fixed on the lifting plate, and the ultrasonic base is between the two shaft shoulder tracks.

[0009] Preferably, the stationary recess comprises a fixed part and sliding parts fixed on both ends of the fixed part, the sliding parts are connected with the corresponding shaft shoulder tracks through sliding blocks, the central hole is arranged in the middle of the fixed part, and the light hole is arranged on the side surface of the fixed part.

[0010] Preferably, the flange has two, the two flanges are fixed on the two ends of the ultrasonic vibration device, the two ends of the two flanges are respectively connected with the corresponding sliding rods, and the flange located at the rear end of the ultrasonic vibration device is connected with the telescopic rod of the pneumatic cylinder.

[0011] Preferably, the ultrasonic base comprises a mounting frame, a mounting plate and a side plate, the mounting frame is fixed to the lifting component, the mounting plate is fixed to the upper end of the mounting frame, the slide rod is mounted on the mounting plate, the side plate is fixed to the rear end of the mounting plate, and the side plate is provided with a receiving hole through which the tail end of the ultrasonic vibration device passes.

[0012] The water-cooled auxiliary ultrasonic enhanced friction-stir additive repair method is characterized in that the water-cooled auxiliary ultrasonic enhanced friction-stir additive repair device is used, and the method comprises the following steps:

[0013] S1, fixing the workpiece to be repaired on the workbench, placing the initial repair area of the workpiece to be repaired directly below the main shaft, adjusting the height of the lifting platform to make the bottom of the water-cooled shoulder have a certain gap with the surface of the initial repair area, fixing the additive repair rod to the main shaft, adjusting the position of the stationary concave platform to make the additive repair rod pass through the center hole of the stationary concave platform and the water-cooled shoulder, and making the end of the additive repair rod contact the initial repair area, adjusting the position of the ultrasonic vibration device to make the head of the tool head of the ultrasonic vibration device pass through the light hole and contact the side surface of the repair rod;

[0014] S2, setting the rotating speed of the main shaft, the vibration frequency of the ultrasonic vibration device, the power of the power supply of the ultrasonic vibration device, the moving speed of the workbench, the pressure of the air cylinder and the parameters of the water cooling equipment;

[0015] S3, the air cylinder drives the ultrasonic vibration device to apply a constant pressure to the side surface of the additive repair rod, the water cooling equipment is started to make the cooling water flow through the water guide hole of the water-cooled shoulder at a constant speed, the ultrasonic vibration device is started to cause the rod to continuously vibrate, the main shaft and the workbench are started, and the workbench starts to move in the repair direction, while the additive repair rod descends at an appropriate speed under the control of the main shaft, the end of the additive repair rod is deposited on the surface of the base material under the friction-stir softening and extrusion of the water-cooled shoulder, and the friction-stir additive repair in the moving direction of the workbench is realized;

[0016] S4, when the additive repair of the layer is completed, the main shaft is lifted, the lifting platform is lifted under the control of the air cylinder, and the workpiece to be repaired is reversely moved under the driving of the workbench to realize the additive repair of the next layer, and the steps S3 and S4 are repeated to realize the multi-layer deposition and stacking additive repair.

[0017] Preferably, in step S3, the rotating speed of the main shaft is 200-3000 rpm, the speed of the additive repair rod pressed by the main shaft is 0.1-10 mm / min, the moving speed of the workbench driven by the workpiece to be repaired is 5-500 mm / min, the vibration frequency of the ultrasonic vibration device is 20 kHz, the power of the power supply of the ultrasonic vibration device is 1000 W, and the pressure provided by the air cylinder is 50-500 N.

[0018] The present application has the following advantages over the prior art:

[0019] 1、The present application realizes the ultrasonic water cooling auxiliary friction stir additive repair process by designing the ultrasonic water cooling mechanism, solves the technical problem that it is difficult to coordinate between ensuring plastic forming and avoiding precipitation phase coarsening during repairing aluminum alloy components, and efficiently and high-quality strengthens the organization and performance of the repair area.

[0020] 2、Compared with the existing AFSD technology, the present application realizes an additive repair technology based on a traditional friction stir mechanism, adds an ultrasonic water cooling mechanism, an ultrasonic enhancement mechanism and a numerical control machine tool mechanism on the basis of the traditional friction stir welding mechanism, so as to complete the ultrasonic composite friction stir additive repair of the present application, and greatly saves the development and manufacturing cost of the AFSD welding machine. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structure schematic view of the water cooling auxiliary ultrasonic enhancement friction stir additive repair device of embodiment 1 of the present application.

[0022] Figure 2 is a structure schematic view of the ultrasonic water cooling mechanism of embodiment 1 of the present application.

[0023] Figure 3 is a schematic view of the water cooling shoulder, the stationary recess, the sleeve and the main shaft of embodiment 1 of the present application.

[0024] Figure 4 is a sectional view of the water cooling shoulder and the stationary recess after assembly of embodiment 1 of the present application.

[0025] Figure 5 is a first perspective sectional view of the water cooling shoulder of embodiment 1 of the present application.

[0026] Figure 6 is a sectional view of the water cooling shoulder in the overhead direction of embodiment 1 of the present application.

[0027] Figure 7 is a second perspective sectional view of the water cooling shoulder of embodiment 1 of the present application.

[0028] Figure 8 is a sectional view of the water cooling shoulder in the overhead direction of embodiment 2 of the present application.

[0029] Figure 9 is a second perspective sectional view of the water cooling shoulder of embodiment 3 of the present application.

[0030] Figure 10 is a sectional view of the sleeve of embodiment 1 of the present application.

[0031] Among them, 1 is the main shaft, 2 is the workbench, 3 is the ultrasonic water cooling mechanism, 4 is the water-cooled shoulder, 5 is the stationary concave platform, 6 is the water cooling equipment, 7 is the guide tube, 8 is the shoulder track, 9 is the ultrasonic vibration device, 10 is the flange, 11 is the ultrasonic base, 12 is the lifting component, 13 is the light hole, 14 is the center hole, 15 is the water guide channel, 16 is the slide rod, 17 is the cylinder, 18 is the sleeve, 19 is the tool handle, 20 is the cylindrical part, 21 is the outer edge part, 22 is the thread, 23 is the threaded hole, 24 is the lifting component, 25 is the lifting base, 26 is the lifting plate, 27 is the lifting track, 28 is the electric cylinder, 29 is the motor, 30 is the fixed part, 31 is the sliding part, 32 is the mounting frame, 33 is the mounting plate, 34 is the side plate, 35 is the accommodating hole, and 36 is the inclined surface. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings and examples.

[0033] Example 1

[0034] like Figures 1 to 4 The water-cooling assisted ultrasonic enhanced stir friction additive repair device shown in the figure includes a main shaft, a workbench and an ultrasonic water cooling mechanism, wherein the main shaft is arranged above the workbench; the ultrasonic water cooling mechanism includes a water-cooled shaft shoulder, a stationary concave table, a water cooling device, a conduit, a shaft shoulder track, an ultrasonic vibration device, a flange, an ultrasonic base and a lifting component, wherein the lifting component is installed on the outside of the workbench, the stationary concave table is installed on the lifting component through the shaft shoulder track, and the stationary concave table is located above the workbench, the water-cooled shaft shoulder is installed at the lower end of the stationary concave table, and the side of the stationary concave table is provided with an ultrasonic vibration device. The tool head passes through the light hole, the middle part of the static recess and the water-cooling shoulder are both provided with a center hole through which the additive repair rod fixed to the main shaft passes, the light hole through which the tool head of the ultrasonic vibration device passes is communicated with the center hole, the water-cooling shoulder is provided with a water guide channel, and the water guide channel is connected to the water cooling equipment through a water-cooling pipe; the ultrasonic vibration device is fixed to the flange, and the flange is mounted on the ultrasonic base through a sliding rod, and the ultrasonic base is mounted on the lifting component, and the tool head of the ultrasonic vibration device is coaxially arranged with the light hole; the ultrasonic base is provided with a cylinder, and the telescopic rod of the cylinder is connected to the flange.

[0035] Specifically, the workbench can drive the workpiece to be repaired to move in the repair direction, that is, along the horizontal X-axis and Y-axis directions; the ultrasonic vibration device is installed on the sliding rod on the ultrasonic base through a flange, and the cylinder can drive the ultrasonic vibration device to move along the Y-axis direction, so that the tool head of the ultrasonic vibration device passes through the light hole and offsets the additive repair rod fixed on the main shaft, thereby transmitting ultrasound to the additive repair rod, and using the ultrasonic plastic effect to achieve the purpose of promoting metal deposition; at the same time, when the additive repair rod repairs the repair area by stirring friction, the cooling structure composed of the water-cooled shaft shoulder, the stationary concave table and the water cooling equipment cools the repair area to reduce the impact of thermal cycles on the repetitive heat treatment of the deposited alloy. This uses a combination of ultrasound and water cooling to assist the stir friction additive repair process, which solves the technical problem of ensuring plastic forming and avoiding coordinating the precipitation phase when repairing aluminum alloy components, and enhances the organization and performance of the repair area with high efficiency and high quality.

[0036] Among them, in order to ensure the stability of the additive repair rod, the additive repair rod is fixed to the tool holder of the spindle through a sleeve, such as Figure 10 As shown in the figure, this sleeve includes a cylindrical portion with a closed top and an outer edge portion fixed to the lower end of the cylindrical portion. The additive repair rod is inserted into the inner cavity of the cylindrical portion and then fixed by screws. The water-cooled shoulder is connected to the stationary recessed platform by a threaded connection. Specifically, the upper end of the water-cooled shoulder is provided with a thread, and the lower end of the stationary recessed platform is provided with a threaded hole that matches the upper end of the water-cooled shoulder. At the same time, as Figures 4 to 7 As shown, the bottom surface of the water-cooled shoulder is set horizontally.

[0037] like Figure 5 and Figure 6 As shown, there are two water channels, symmetrically arranged about the axis of the water-cooled shoulder. Specifically, the two channels are located on either side of the central hole of the water-cooled shoulder. This arrangement ensures both sufficient cooling capacity and uniform cooling distribution for the water-cooled shoulder, thereby ensuring effective cooling of the shoulder. The number of water channels is not limited to two; an even number can also be used to ensure effective cooling of the water-cooled shoulder.

[0038] The lifting component comprises two groups of lifting assemblies arranged on the two sides of the workbench, each lifting assembly comprising a lifting base, a lifting plate, a lifting rail, an electric cylinder and an electric motor, the lower end of the lifting rail being mounted on the lifting base, the two ends of the lifting plate being respectively mounted on the corresponding lifting rails, the electric cylinder and the electric motor being mounted on the lifting base, the electric motor being connected with the electric cylinder, and the telescopic rod of the electric cylinder being connected with the lifting plate; the two ends of the shaft shoulder rail are respectively fixed on the corresponding lifting plates, the ultrasonic base is fixed on the lifting plate, and the ultrasonic base is located between the two shaft shoulder rails. The lifting component has a simple structure and ensures the stability of the water-cooled structure composed of the water-cooled shaft shoulder, the stationary recess and the water-cooled equipment and the ultrasonic vibration device during lifting, thereby ensuring the effective operation.

[0039] The stationary recess comprises a fixed part and sliding parts fixed on the two ends of the fixed part, the sliding parts are connected with the corresponding shaft shoulder rails through sliding blocks, the center hole is arranged in the middle of the fixed part, and the light hole is arranged on the side surface of the fixed part. Specifically, the stationary recess has a simple structure, ensures the stability of the movement of the water-cooled shaft shoulder, and ensures the working effect of the water-cooled shaft shoulder.

[0040] The flanges are two, the two flanges are fixed on the two ends of the ultrasonic vibration device, the two ends of the two flanges are respectively connected with the corresponding sliding rods, and the flange located at the rear end of the ultrasonic vibration device is connected with the telescopic rod of the air cylinder. The arrangement of the two flanges ensures the stability of the ultrasonic vibration device, so as to ensure the working performance of the ultrasonic vibration device.

[0041] The ultrasonic base comprises a mounting frame, a mounting plate and a side plate, the mounting frame is fixed on the lifting component, the mounting plate is fixed on the upper end of the mounting frame, the sliding rod is mounted on the mounting plate, the side plate is fixed on the rear end of the mounting plate, and the side plate is provided with an accommodation hole through which the tail end of the ultrasonic vibration device passes. This structure is simple and compact, and ensures the stability of the ultrasonic vibration device. When the ultrasonic vibration device is not working, the tool head of the ultrasonic vibration device moves out of the light hole, and the tail end of the ultrasonic vibration device can be inserted into the accommodation hole. This structure is compact and ensures that the ultrasonic vibration device has sufficient moving distance.

[0042] The water-cooled auxiliary ultrasonic enhanced friction stir additive repair method adopts the water-cooled auxiliary ultrasonic enhanced friction stir additive repair device, and comprises the following steps:

[0043] S1, fix the workpiece to be repaired on the workbench, place the initial repair area of the workpiece to be repaired directly below the main shaft, adjust the height of the lifting platform, so that the bottom of the water-cooled shaft shoulder has a certain gap with the surface of the initial repair area, fix the additive repair rod to the main shaft, adjust the position of the stationary concave platform, make the additive repair rod pass through the center hole of the stationary concave platform and the water-cooled shaft shoulder, so that the end of the additive repair rod is in contact with the initial repair area, adjust the position of the ultrasonic vibration device, so that the tool head of the ultrasonic vibration device passes through the light hole and is in contact with the side of the repair rod;

[0044] S2, set the rotating speed of the main shaft, the vibration frequency of the ultrasonic vibration device, the power of the ultrasonic vibration device, the moving speed of the workbench, the cylinder pressure and the water cooling device parameters;

[0045] S3, the cylinder drives the ultrasonic vibration device to apply constant pressure to the side of the additive repair rod, starts the water cooling device, makes the cooling water flow through the water guide hole of the water-cooled shaft shoulder at a constant speed, starts the ultrasonic vibration device, causes the rod to vibrate continuously, starts the main shaft and the workbench, the workbench starts to move in the repair direction, at the same time the additive repair rod descends at an appropriate speed under the control of the main shaft, the end of the additive repair rod is deposited on the surface of the base material under the stirring friction softening and extrusion of the water-cooled shaft shoulder, realizes the stirring friction additive repair along the moving direction of the workbench;

[0046] S4, when the additive repair of the layer is completed, the main shaft is lifted, the cylinder controls the lifting platform to be lifted, the workpiece to be repaired is reversely moved under the driving of the workbench, realizes the additive repair of the next layer, and the steps S3 and S4 are repeated to realize the multi-layer deposition and stacking additive repair.

[0047] In step S3, the rotating speed of the main shaft is 200-3000 rpm, the speed of the additive repair rod descending under the driving of the main shaft is 0.1-10 mm / min, the moving speed of the workbench driving the workpiece to be repaired is 5-500 mm / min, the vibration frequency of the ultrasonic vibration device is 20 kHz, the power of the ultrasonic vibration device is 1000 W, and the cylinder provides a pressure of 50-500 N.

[0048] Example 2:

[0049] The water-cooled auxiliary ultrasonic enhanced stirring friction additive repair device of the embodiment is the same as that of example 1 except the following technical features: as shown in Figure 8 the water guide channel is annular, and the axis of the water guide channel is on the same straight line as the axis of the water-cooled shaft shoulder. This setting makes the cooling water circulate around the inside of the cooling shaft shoulder, so as to ensure that the cooling water can fully cool the cooling shaft shoulder and ensure the cooling effect of the cooling shaft shoulder on the repair area.

[0050] Example 3:

[0051] The water-cooled auxiliary ultrasonic enhanced friction stir additive repair device of the embodiment is the same as that of embodiment 1 except the following technical features:

[0052] As shown in Figure 9 the bottom surface of the water-cooled shoulder is provided as an inclined surface. The inclined arrangement is helpful for the deposition of the plastic metal, and the inclined bottom surface plays a role of gradual forging on the plastic zone metal, so that a more dense as-deposited structure can be obtained.

[0053] The above specific embodiments are preferred embodiments of the present application, and cannot limit the present application, and any changes or other equivalent replacement manners made without departing from the technical solutions of the present application are included in the protection scope of the present application.

Claims

1. Water-cooling assisted ultrasonic enhanced friction stir additive repair device, characterized by: The ultrasonic water cooling mechanism comprises a spindle, a workbench and an ultrasonic water cooling mechanism, wherein the spindle is arranged above the workbench; the ultrasonic water cooling mechanism comprises a water-cooling shoulder, a stationary concave platform, a water cooling device, a conduit, a shoulder track, an ultrasonic vibration device, a flange, an ultrasonic base and a lifting component, wherein the lifting component is installed on the outside of the workbench, the stationary concave platform is installed on the lifting component through the shoulder track, and the stationary concave platform is located above the workbench, the water-cooling shoulder is installed at the lower end of the stationary concave platform, and the side of the stationary concave platform is provided with a tool head penetrated by the ultrasonic vibration device The optical hole passes through the optical hole, the middle part of the stationary concave table and the water-cooling shoulder are both provided with a central hole passed by the additive repair rod fixed to the main shaft, the optical hole is communicated with the central hole, the water-cooling shoulder is provided with a water guide channel, and the water guide channel is connected to the water cooling equipment through a water-cooling pipe; the ultrasonic vibration device is fixed to the flange, and the flange is mounted on the ultrasonic base through a sliding rod, and the ultrasonic base is mounted on the lifting component, and the tool head of the ultrasonic vibration device is coaxially arranged with the optical hole; the ultrasonic base is provided with a cylinder, and the telescopic rod of the cylinder is connected to the flange.

2. The water-cooling assisted ultrasonic enhanced friction stir additive repair device according to claim 1, characterized in that: There are two water-conducting channels, and the two water-conducting channels are symmetrically arranged relative to the axis of the water-cooling shoulder.

3. The water-cooling assisted ultrasonic enhanced friction stir additive repair device according to claim 1, characterized in that: The water-conducting channel is annular, and the axis of the water-conducting channel and the axis of the water-cooling shoulder are located on the same straight line.

4. The water-cooling assisted ultrasonic enhanced friction stir additive repair device according to claim 1, characterized in that: The bottom surface of the water-cooling shoulder is configured as an inclined surface.

5. The water-cooling assisted ultrasonic enhanced friction stir additive repair device according to claim 1, characterized in that: The lifting component includes two groups of lifting components, which are arranged on both sides of the workbench. The lifting components include a lifting base, a lifting plate, a lifting rail, an electric cylinder and a motor. The lower end of the lifting rail is installed on the lifting base, and the two ends of the lifting plate are respectively installed on the corresponding lifting rails. The electric cylinder and the motor are both installed on the lifting base, the motor is connected to the electric cylinder, and the telescopic rod of the electric cylinder is connected to the lifting plate; the two ends of the shoulder rail are respectively fixed to the corresponding lifting plates, the ultrasonic base is fixed to the lifting plate, and the ultrasonic base is located between the two shoulder rails.

6. The water-cooling assisted ultrasonic enhanced friction stir additive repair device according to claim 1, characterized in that: The stationary recess comprises a fixed portion and sliding portions fixed at both ends of the fixed portion, the sliding portion is connected to the corresponding shoulder track through a slider, the center hole is arranged in the middle of the fixed portion, and the light hole is arranged on the side of the fixed portion.

7. The water-cooling assisted ultrasonic enhanced friction stir additive repair device according to claim 1, characterized in that: There are two flanges, which are fixed at both ends of the ultrasonic vibration device. The two ends of the two flanges are respectively connected to corresponding sliding rods, and the flange located at the rear end of the ultrasonic vibration device is connected to the telescopic rod of the cylinder.

8. The water-cooling assisted ultrasonic enhanced friction stir additive repair device according to claim 1, characterized in that: The ultrasonic base includes a mounting frame, a mounting plate and a side plate. The mounting frame is fixed to the lifting component, the mounting plate is fixed to the upper end of the mounting frame, the sliding rod is installed on the mounting plate, the side plate is fixed to the rear end of the mounting plate, and the side plate is provided with a receiving hole through which the tail end of the ultrasonic vibration device passes.

9. Water-cooling-assisted ultrasonically enhanced friction stir additive repair method, characterized by: The water-cooling-assisted ultrasonically enhanced friction stir additive repair device according to any one of claims 1 to 8 comprises the following steps: S1. Fix the workpiece to be repaired on the workbench, place the initial repair area of ​​the workpiece to be repaired directly under the spindle, adjust the height of the lifting platform so that there is a certain gap between the bottom of the water-cooled shoulder and the surface of the initial repair area, fix the additive repair rod to the spindle, adjust the position of the stationary recessed platform, pass the additive repair rod through the center hole of the stationary recessed platform and the water-cooled shoulder, and make the end of the additive repair rod contact the initial repair area, and adjust the position of the ultrasonic vibration device so that the tool head of the ultrasonic vibration device passes through the optical hole and contacts the side of the repair rod; S2. Setting the spindle speed, the vibration frequency of the ultrasonic vibration device, the power supply of the ultrasonic vibration device, the moving speed of the workbench, the cylinder pressure, and the water cooling equipment parameters; S3. The cylinder drives the ultrasonic vibration device to apply constant pressure to the side of the additive repair rod, starts the water cooling equipment, allows the cooling water to flow at a uniform speed through the water guide hole of the water-cooled shoulder, starts the ultrasonic vibration device, causes the rod to vibrate continuously, starts the spindle and the workbench, and the workbench begins to move in the repair direction. At the same time, the additive repair rod descends at an appropriate rate under the control of the spindle. The end of the additive repair rod is deposited on the substrate surface under the stir friction softening and the extrusion of the water-cooled shoulder, realizing stir friction additive repair along the moving direction of the workbench; S4. When the additive repair of the current layer is completed, the spindle is lifted, the electric cylinder controls the lifting platform to lift, and the workpiece to be repaired moves in the opposite direction driven by the workbench to realize the additive repair of the next layer. Steps S3 and S4 are repeated to realize the additive repair of multiple layers of deposition stacking.

10. The water-cooling assisted ultrasonic enhanced friction stir additive repair method according to claim 9, characterized in that: In step S3, the spindle speed is 200-3000rpm, the spindle drives the additive repair rod to press down at a speed of 0.1-10mm / min, the worktable drives the workpiece to be repaired to move at a speed of 5-500mm / min, the vibration frequency of the ultrasonic vibration device is 20kHZ, the power supply power of the ultrasonic vibration device is 1000W, and the pressure provided by the cylinder is 50-500N.

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